package chapter10.login;
import java.sql.*;
import java.util.Scanner;

public class login {
    public static void main(String[] args) throws SQLException {
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            //1.注册数据库的驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.通过DriverManager获取数据库连接
            String url =
                    "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSl=false";
            String username = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url, username, password);
            /**
             * 终端用户登录
             * 不绑定数据使用conn.createStatment()
             * 绑定数据使用 conn.preparStatement(sql);
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("用户登录");
            System.out.println("请输入你的姓名：");
            String userName = sc.next();
            System.out.println("请输入你的密码：");
            String userPwd = sc.next();
            String loginSql = "select * from users where name=? and password=?";
            PreparedStatement pm = conn.prepareStatement(loginSql);
            pm.setString(1,userName);
            pm.setString(2,userPwd);
            rs = pm.executeQuery();// executeQuery返回多行数据 executeUpdate()返回一个int
            System.out.println("id     |   name    |    password    |  email     |     birthday");
            while (rs.next()) {
                int id = rs.getByte("id");//通过列名获取指定字段的值
                String name = rs.getString("name");
                String psw = rs.getString("password");
                String email = rs.getString("email");
                Date birthday = rs.getDate("birthday");
                if (id  >0){
                    System.out.println(name + "登陆完成！");
                    // 如果数据库中有两个同名同密码的人 直接结束循环 只提示一个人
                    break;
                }
                System.out.println(id + "|" + name + "|" + psw + "|" + email + "|" + birthday);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            //6.回收数据库资源
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                rs = null;
            }
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn != null) ;
            {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                conn = null;
            }
        }
    }
}

